[clang] [clang] Restrict use of scalar types in vector builtins (PR #119423)

[Fraser Cormack via cfe-commits]

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@@ -6,7 +6,7 @@
 // CHECK: %conv2 = fptrunc double %hlsl.dot to float
 // CHECK: ret float %conv2
 float builtin_bool_to_float_type_promotion ( float p0, bool p1 ) {
-  return __builtin_hlsl_dot ( p0, p1 );
+  return __builtin_hlsl_dot ( (double)p0, (double)p1 );
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frasercrmck wrote:

Thanks for the reply. I think that make sense, thank you.

Note though that I had to make a change to what I think is a user-facing `pow` builtin [here](https://github.com/llvm/llvm-project/pull/119423/files#diff-fdbd201243000d44dd63e6af5706293c968588d762bed9e050d27e0abd6e80acR40), so this PR might still impact HLSL users directly.

https://github.com/llvm/llvm-project/pull/119423